#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include <string>
#include <iostream>
using namespace std;

int main(int argc, char* argv[])

{

	string a = "hello world";

	string b = a;

	if (a.c_str() == b.c_str())

	{

		cout << "true" << endl;

	}

	else cout << "false" << endl;

	string c = b;

	c = "";

	if (a.c_str() == b.c_str())

	{

		cout << "true" << endl;

	}

	else cout << "false" << endl;

	a = "";

	if (a.c_str() == b.c_str())

	{

		cout << "true" << endl;

	}

	else cout << "false" << endl;

	return 0;

}